Chain wrench.



A. J. WHITFIELD.

GHAIN WRENCH.

APPLICATION FILED 82M. 5, 1912.

1,064,036, Patented June 10, 1913.

messes: 2 608765. F ZO/Zzflje ZQZ,

W 53 M, new M NTTED @TATES PATENT OFFICE.

ARTHUR J. WHITFIELD, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO TRIMONT MANUFACTURING COMPANY, OF BOXBURY, MASSACHUSETTS, A CORPORATION OF MAINE.

CHAIN \VRENCH.

Specification of Letters Patent.

Application filed September 5, 1912.

PatentedJune), 1913.

Serial No. 718,615.

To all whom it may cont 7mm Be it known that I, rtn'rnund.\Vurrruna), a citizen of the United States, and resident of Boston, county at Sutlolk, State of Massachusetts, have invented an Improvement in Chain renches, oil: which the tollowing description, in connection with tl accompanying drawing, is a specification, like characters on the drawing representing like parts.

This invention has for its object the production of a strong, powerful chain wrench embodying certain novel features of construction whereby the use of the wrench is facilitated, and such novel features will be fully described in the subjoined specification and particularly pointed out in the tollowing claims.

Figure l is a view in elevation and part section of a chain wrench embodying one practical form of my invention, the end of the handle being broken off to save space; Fig. 2 is a similar view but showing a (litterent position of the swivel connection between the chain and the wrench head, to aecommodate the wrench to a smaller pipe; Fig. 3 is a front view of a portion of the wrench, showing the toothed jaw, the chain being swung back along the handle.

Referring to the drawing, the handle 1 of the wrench formed to present a head 2 provided with a transversely toothed, longitudinally convexed jaw 3, held in place in the head. by a rivet 4t, and the chain 5, may be and are all substantially of well known construction except in such particulars as will be pointed out hereinafter. The tron t of the head adjacent and at the rear of the jaw is inclined, as at 6, to facilitate the use of the wrench in taking up slack when applied to a pipe. As is customary the back of the head is longitudinally recessed, at 7, for the reception of the .iirce end of the bight of the cl1ain,-this recess separating the opposite sides 8 of a bifurcated or two-part abutment, having its rear face concaved, at 9. to present hook-like portions. Said abutment faces are ada 'ited to engage lateral projections 10 on the tree end of the chain, and herein I have shown these projections as the pivot-pins connecting the ends ot sucessive links, and extended beyond the sides oi the chain to engage the abutment when the free end of the chain is extended along the recess 7. The said projections are regularly spaced apart. so that it will be manilest the chain can be taken up or let out one or more units, according to the diameter of the pipe to be handled, each unit being the distance between the centers o'l' two successive pivotpins 10. it, however, it is desired to take up or .letout the chain to an intermediate point other means must he provided, and. heroin such means is comprehended in what I have termed an eccentric swivel connection which attaches pcrlmmently one end of the chain to the wrench head.

As shown in the present embodiment of my invention the wrench head has formed in it, at the rear of the jaw, a hole 11 counterbored at 12, to receive a stud 13, the reduced shank 1 lentering the hole 11 and being headed or upset at 15, on the back of the wrench head. The end of the stud is slabbed oil" to leave a flat head 16 projecting therefrom beyond the front of the head, and this head has a transverse aperture 17, see Fig. 2, which is otl'set from or eccentric to the axis of rotation of the stud. The head 16 passes between the opposite pair of tern'iinal links of the chain 5 and is permanently connected therewith by a pivot-pin 18. The eccentricity of this pin is preferably onequarter of the distance between centers of a pair of the projections 10 of the chain, and it will be understood that if the stud 1?, is given a halt revolution from the position shown in Fig. 1 to that shown in Fig. 2 the eccentricity will be doubled, and hence such a change in the stud equals one-half the distance between the projections 10. If, now, for a pipe A, Fig. 1, it is assumed that the proper grip can be had, with the projection 1O in engagement with the abutment 8, and with the et'zcent'ric swivel connection p0- sitioncd as in said Fig. i, it will be clear that for a pipe B, Fig. 2, having a slightly smaller diameter the chain must be taken up. The amount taken up by the distance between adjacent projections 10 is too great, but the desired adjustment is eflccted by giving the stud 13 a halt turn to the position shown in Fig. 2, and placing the chain about the pipe, the same projection 10" engaging the abutment. It will be understood that this is merely "For purposes of illustration, but in any event the shitting ot. the pivot pin 18 from the position shown in Fig. 1 to that shown in Fig. or vice versa, makes a difference in the effective length of the chain equal toa predetermined fraction of the distance between successive projections 10.

The eccentric swivel connection between the chain and the wrench head is strong and durable, and it can be readily constructed at a low cost, while the operation of the wrench is simple and its action is greatly improved by the adjustability herein pro vided.

Having fully described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In a chain wrench, a handle having a head and an attached jaw, a chain, an eecentric swivel connection between one end of the chain and the wrench, and means on the wrench to detachably engage the free end of the chain when passed around the head and jaw.

2. In a chain wrench having a head and a convexed jaw, and a cooperating chain, in combination, an eccentric swivel connection between the head and one end of the chain, at the rear of the jaw, and means on the head to engage detachably the free end of a bight of the chain passed around the jaw.

3. In a chain wrench having a aw, a co operating chain, a stud rotatably mounted in the head of the wrench, and an eccentric, pivotal connection between one end of the chain and said stud.

4. In a chain wrench having a head provided on one side with a bifurcated abutment having a concave rear face, a chain, a permanent eccentric swivel connection between one end thereof and the opposite side of the head, and lateral projections on the chain to engage detachably the concave faces of the abutment.

5. In a chain wrench, in combination, a head having a aw, a stud rotatably mounted in the head at the rear of the jaw, a chain, a transverse pivotal connection between one end thereof and said stud, eccentric to the axis thereof, and means on the head to engage detachably the free end of a bight of the chain passed around the 6. In a chain wrench, in combination, a head having a aw, a stud rotatably mounted in the head at the rear of the jaw, said stud having a flattened, projecting head provided with a transverse aperture eccentric to the axis of the stud, a chain having a terminal link to embrace the stud-head, a pin extended through the terminal link and the apertured stud-head, to pivotally connect the chain thereto, and means on the wrench head to engage detachably the free end of the chain.

7 The combination, in a chain wrench, of a pair of laterally separated, hook-like abutments on the wrench head, a chain having at its free end regularly spaced, lateral projections to engage detachably the pair of abutments, and an eccentric swivel connection between the other end of the chain and the wrench, head, whereby the effective length of the chain can be varied.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

ARTHUR J. WHITFIELD.

Witnesses:

CI-IARLns G. ELY, WILLIAM T. H. SALTER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

